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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Parker Markel | 0.55 | 2014 | |
| 2 | Kevin McAvoy | 0.86 | 2018 | |
| 3 | Yefry Ramirez | 0.96 | 2017 | |
| 4 | Andrew Church | 1.15 | 2015 | |
| 5 | Tanner Peters | 1.31 | 2014 | |
| 6 | Luis Rijo# | 1.32 | 2026 | |
| 7 | Miguel Celestino | 1.38 | 2013 | |
| 8 | Connor Thomas# | 1.50 | 2021 | |
| 8 | Tanner Peters | 1.50 | 2013 | |
| 10 | Jesse Biddle | 1.52 | 2013 | |
| 11 | Matt Brazis | 1.53 | 2013 | |
| 12 | Jake Stinnett | 1.70 | 2018 |
